// 注册自定义拖拽指令，弥补 modal 组件不能拖动的缺陷
//可拖拽模态框的指令
const dragModalDirective = {
  inserted(el, binding, vnode, prevVnode) {
    const { visible, destroyOnClose } = vnode.componentInstance
    // 防止未定义 destroyOnClose 关闭弹窗时dom未被销毁，指令被重复调用
    if (!visible) return
    const modal = el.getElementsByClassName('ant-modal')[0]
    const header = el.getElementsByClassName('ant-modal-header')[0]
    let left = 0
    let top = 0

    // 设置遮罩层可滚动
    setTimeout(() => {
      document.body.style.width = '100%'
      document.body.style.overflowY = 'inherit'
    }, 0)

    // 鼠标变成可移动的指示
    header.style.cursor = 'move'

    // 未定义 destroyOnClose 时，dom未被销毁，关闭弹窗再次打开，弹窗会停留在上一次拖动的位置
    if (!destroyOnClose) {
      left = modal.left || 0
      top = modal.top || 0
    }
    // top 初始值为 offsetTop
    top = top || modal.offsetTop
    header.onmousedown = e => {
      const startX = e.clientX
      const startY = e.clientY
      header.left = header.offsetLeft
      header.top = header.offsetTop
      el.onmousemove = event => {
        const endX = event.clientX
        const endY = event.clientY
        modal.left = header.left + (endX - startX) + left
        modal.top = header.top + (endY - startY) + top
        modal.style.left = modal.left + 'px'
        modal.style.top = modal.top + 'px'
      }
      el.onmouseup = event => {
        left = modal.left
        top = modal.top
        el.onmousemove = null
        el.onmouseup = null
        header.releaseCapture && header.releaseCapture()
      }
      header.setCapture && header.setCapture()
    }
  }
// Vue.directive('drag-modal', (el, bindings, vnode) => {
//   Vue.nextTick(() => {
    
//   })
// })
}

export default dragModalDirective